Head up display system
US4763990A · kind A · utility
86Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Sep 16, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of preventing a reduction in image contrast in a head-up display. The head-up display is comprised of a visual information source, a lens, a wavelength selective reflecting element, and a combiner which reflects at least some of the wavelengths from the information source which reflect off the reflecting element. The reflecting element, in addition to being wavelength selective, is provided with optical power to reduce aberrations which would otherwise result from operating the combiner at an off-axis angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.